Static Grain Growth in an Austenitic Stainless Steel Subjected to Intense Plastic Straining
The post-dynamic recrystallization of an ultrafine grained 304-type austenitic stainless steel was studied during annealing at 800 and 1000°C for 7.5 to 480 minutes. The initial ultrafine grained microstructures have been developed by continuous dynamic recrystallization during isothermal multidirectional forging to a total strain of ∼4 at temperatures ranging from 500 to 800°C. The post-dynamic recrystallization involves a rapid softening at early stage of annealing followed by a sluggish decrease of hardness upon further annealing. A transient recrystallization at early annealing stage results in somewhat heterogeneous microstructures in the samples subjected to previous deformation at relatively low temperatures of 500-600°C. This structural heterogeneity disappears with increasing the annealing time. Commonly, the post-dynamic recrystallization behavior can be considered as a kind of continuous recrystallization.
B. Mishra, M. Ionescu and T. Chandra
M. Tikhonova et al., "Static Grain Growth in an Austenitic Stainless Steel Subjected to Intense Plastic Straining", Materials Science Forum, Vols. 783-786, pp. 1021-1026, 2014